[Extensions] Allow extensions to set a rectangular icon for the extension action

chrome/browser/extensions/api/extension_action/extension_action_api.cc

Index: chrome/browser/extensions/api/extension_action/extension_action_api.cc
diff --git a/chrome/browser/extensions/api/extension_action/extension_action_api.cc b/chrome/browser/extensions/api/extension_action/extension_action_api.cc
index 1af27cb18542297342f1d8844727de3d8da819b1..bb53890101893cfb1f3b402498e2d8fa8e01ab35 100644
--- a/chrome/browser/extensions/api/extension_action/extension_action_api.cc
+++ b/chrome/browser/extensions/api/extension_action/extension_action_api.cc
@@ -506,6 +506,11 @@ bool ExtensionActionSetIconFunction::RunExtensionAction() {
     EXTENSION_FUNCTION_VALIDATE(
         ExtensionAction::ParseIconFromCanvasDictionary(*canvas_set, &icon));
 
+    if (icon.isNull()) {
+      error_ = "Icon invalid.";
+      return false;
+    }
+
     extension_action_->SetIcon(tab_id_, gfx::Image(icon));
   } else if (details_->GetInteger("iconIndex", &icon_index)) {
     // Obsolete argument: ignore it.